/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
a {
    text-decoration: none; /* 去除下划线 */
    color: inherit; /* 继承父元素的字体颜色 */
    font-size: inherit; /* 继承父元素的字体大小 */
    font-weight: inherit; /* 继承父元素的字体粗细 */
    background-color: transparent; /* 背景色透明 */
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* 顶部导航栏 */
.header {
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.top-nav {
    border-bottom: 1px solid #e8eaec;
    height: 80px;
    padding-top: 10px;
}

.nav-left {
    display: flex;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.ai-logo img {
    height: 60px;
    width: auto;
    display: block;
}

.main-nav {
    display: flex;
    gap: 0;
    margin-left: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    text-decoration: none;
    color: #666;
    font-size: 16px;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.nav-item:hover {
    color: #1890ff;
    background-color: #f0f8ff;
}

.nav-item.active {
    color: #1890ff;
    border-bottom-color: #1890ff;
    background-color: #f0f8ff;
}

.nav-item i {
    font-size: 16px;
}

/* 主要内容区域 */
.main-content {    
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

/* 底部版块 */
.footer-section {
    background: linear-gradient(135deg, #1e293b 0%, #334155 50%, #475569 100%);
    color: white;
    padding: 0px 0 20px;
    margin-top: 40px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 600px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo i {
    font-size: 28px;
    color: white;
}

.footer-logo span {
    font-size: 24px;
    font-weight: 700;
    color: white;
}

.footer-description {
    font-size: 16px;
    line-height: 1.6;
    color: #cbd5e1;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    color: #cbd5e1;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-link:hover {
    background: #8B5CF6;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.3);
}

.social-link i {
    font-size: 20px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.link-group {
    min-width: 0;
}

.link-title {
    font-size: 18px;
    font-weight: 600;
    color: white;
    margin-bottom: 20px;
    position: relative;
}

.link-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 2px;
    background: #8B5CF6;
    border-radius: 1px;
}

.link-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.link-list li {
    margin-bottom: 12px;
}

.link-list a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    display: block;
    padding: 4px 0;
}

.link-list a:hover {
    color: #8B5CF6;
    transform: translateX(4px);
}


.footer-info {
    flex: 1;
}

.contact-info {
    display: flex;
    gap: 40px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #cbd5e1;
    font-size: 14px;
}

.contact-item i {
    color: #8B5CF6;
    font-size: 16px;
    width: 16px;
}

.footer-copyright {
    color: #94a3b8;
    font-size: 12px;
    line-height: 1.5;
}

.footer-copyright p {
    margin: 4px 0;
}

.footer-qr {
    flex-shrink: 0;
    display: flex;
    gap: 16px;
}

.qr-code {
    text-align: center;
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.qr-code img {
    width: 120px;
    height: 120px;
    border-radius: 8px;
    margin-bottom: 12px;
}

.qr-code p {
    color: #cbd5e1;
    font-size: 14px;
    margin: 0;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* 通用响应式设计 */
@media (max-width: 1024px) {
    .footer-main {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .contact-info {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .nav-left {
        padding: 0 16px;
    }
    /* 移动端缩小头部 LOGO 尺寸 */
    .ai-logo img {
        height: 44px;
    }
    /* 移动端顶部导航垂直居中 */
    .top-nav {
        height: 56px;
        padding-top: 0;
        display: flex;
        align-items: center;
    }
    .nav-left { height: 56px; display:flex; align-items:center; }
    .ai-logo { display:flex; align-items:center; }
    
    .main-nav {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .nav-item {
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .footer-section {
        padding: 40px 0 20px;
        margin-top: 40px;
    }
    
    .footer-content {
        padding: 0 16px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        gap: 30px;
        text-align: center;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }
    
    .footer-brand {
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-qr {
        justify-content: center;
        flex-wrap: wrap;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .nav-item span {
        display: none;
    }
    
    .footer-section {
        padding: 30px 0 20px;
    }
    
    .footer-logo {
        justify-content: center;
    }
    
    .footer-logo span {
        font-size: 20px;
    }
    
    .footer-description {
        font-size: 14px;
    }
    
    .social-link {
        width: 40px;
        height: 40px;
    }
    
    .social-link i {
        font-size: 18px;
    }
    
    .qr-code {
        padding: 16px;
    }
    
    .qr-code img {
        width: 100px;
        height: 100px;
    }
}